A generic framework for checking semantic equivalences between pushdown automata and finite-state automata

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Abstract

For a given process equivalence, we say that a process g is fully equivalent to a process f of a transition system T if g is equivalent to f and every reachable state of g is equivalent to some state of T. We propose a generic method for deciding full equivalence between pushdown processes and finite-state processes applicable to every process equivalence satisfying certain abstract conditions. Then, we show that these conditions are satisfied by bisimulation-like equivalences (including weak and branching bisimilarity), weak simulation equivalence, and weak trace equivalence, which are the main conceptual representatives of the linear/branching time spectrum. The list of particular results obtained by applying our method includes items which are first of their kind, and the associated upper complexity bounds are essentially optimal.

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Kučera, A., & Mayr, R. (2018). A generic framework for checking semantic equivalences between pushdown automata and finite-state automata. Journal of Computer and System Sciences, 91, 82–103. https://doi.org/10.1016/j.jcss.2017.09.004

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